If you develop a new vaccine, and if you confirm through repeated tests that it causes elevated levels of autism, then yes, you can now say "vaccines can cause

If you develop a new vaccine, and if you confirm through repeated tests that it causes elevated levels of autism, then yes, you can now say "vaccines can cause autism." Or rather, in order to now claim that vaccines don't cause autism you will need to say "rigorously tested vaccines don't cause autism"